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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-571) Path should use URI syntax
Date Mon, 02 Oct 2006 21:51:19 GMT
Path should use URI syntax

                 Key: HADOOP-571
                 URL: http://issues.apache.org/jira/browse/HADOOP-571
             Project: Hadoop
          Issue Type: Improvement
          Components: fs
            Reporter: Doug Cutting

The following changes are proposed:
1. Add a factory/registry of FileSystem implementations.  Given a protocol, hostname and port,
it should be possible to get a FileSystem implementation.
2. Path's constructor should accept URI-formatted strings & a configuration.
3. A new Path method should be added: FileSystem.getFileSystem().  This returns the filesystem
named in the path or the default configured filesystem.
4. Most methods which currently take FileSystem and Path parameters can be changed to take
only Path.
5. Many FileSystem operations (create, open, delete, list, etc.) can become convenience methods
on Path.
6. A URLStreamHandler can be defined in terms of the FileSystem API, so that URLs for any
protocol with a registered FileSystem implementation can be accessed with a java.net.URL,
permitting FileSystem implementations to be used on the classpath, etc.

It is tempting to try to replace Path with java.net.URL, but URL's methods are insufficient
for mapreduce.  We require directory listings, random access, location hints, etc., which
are not supported by existing URLStreamHandler implementations.  But we can expose all FileSystem
implementations for access with java.net.URL.

(From a brainstorm with Owen.)

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